package com.ruoyi.common.security.utils;

import org.apache.commons.codec.binary.Base64;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.security.*;
import java.security.spec.InvalidParameterSpecException;

/**
 * @Program: hotdog
 * @Desc: Description
 * @Author: Allen Liu
 * @Created at 2018-11-04 15:24
 */
public class AesCbcUtil {
    static {
        //BouncyCastle是一个开源的加解密解决方案
        Security.addProvider(new BouncyCastleProvider());
    }


    /**
     * AES解密
     * @param data           //密文，被加密的数据
     * @param key            //秘钥
     * @param iv             //偏移量
     * @param encodingFormat //解密后的结果需要进行的编码
     * @return
     * @throws Exception
     */
    public static String decrypt(String data, String key, String iv, String encodingFormat) throws Exception {
//        initialize();

        //被加密的数据
        byte[] dataByte = Base64.decodeBase64(data.getBytes());
        //加密秘钥
        byte[] keyByte = Base64.decodeBase64(key.getBytes());
        //偏移量
        byte[] ivByte = Base64.decodeBase64(iv.getBytes());


        try {
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding","BC");

            SecretKeySpec spec = new SecretKeySpec(keyByte, "AES");

            AlgorithmParameters parameters = AlgorithmParameters.getInstance("AES");
            parameters.init(new IvParameterSpec(ivByte));

            cipher.init(Cipher.DECRYPT_MODE, spec, parameters);// 初始化

            byte[] resultByte = cipher.doFinal(dataByte);
            if (null != resultByte && resultByte.length > 0) {
                String result = new String(resultByte, encodingFormat);
                return result;
            }
            return null;
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidParameterSpecException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (InvalidAlgorithmParameterException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        return null;
    }

    public static void main(String[] args) throws Exception{
        String data="ZJv1aRvHluCj6bghNXvQGZaZKZ2HjVrsjx5fqWM7bhOONyXGPFFp11P4qvrU95/q8LDy7n9apaBYNmcucOKUNyuyBhk/mfp4eey+fB2/Z3Z5A0qd6pBOwm6zx7x39U9RCW54/JBc7Nm6ZF/qV8A+j7LZ7OMPZSe/yZXqaFG4qD2odj4zDCppAzfWQjYR8LeJh2F6HfWdAVGpbnE+uhP5z5/UgDU0XeudUUPXZw4IuZEHUj9p5fRy/d2n2D4/w9Z/wgpiK0Mv3jRSzbYlLKE1ffZ7d0rtAkgnzIJc4y//18mXArPI/U5P4mqrByNwPcjt7ItPGbNZHFGuZG84KN1NKfU66fgrYnxlx85hnez/eQskRvc70Sz9il/VgTJxTagTKj7NjsSERWBzQLOhGJyr/o7hoMls9Psg/kva3qY/RdPF7b/ZjqCl1IXoOaRjvuzGB8XR4+r0VW5gxRUEuvGl7w==";
        String iv =  "Qxor4UDvHaiqOvSaINBCYQ==";


        String key = "KShv2SJ4ORuO0qMgAXos3w==";

        System.out.println(data.contains(" "));
        System.out.println(AesCbcUtil.decrypt(data,key,iv,"UTF-8"));
    }
}
